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Isolation of Elements question

2010 · Shift 1 · Q23
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Isolation of Elements question

2010 · Shift 1 · Q23

JEE AdvancedChemistryIsolation of ElementsMCQ+3 / −1
Copper is the most noble of the first row transition metals and occurs in small deposits in several countries. Ores of copper inculcated chalcanthite (CuSO 4{}_44​ . 5H 2{}_22​ O), atacamite (Cu 2{}_22​ Cl(OH) 3{}_33​), cuprite (Cu 2{}_22​ O), copper glance (Cu 2{}_22​ S) and malacite (Cu 2{}_22​(OH) 2{}_22​ CO 3{}_33​). However, 80% of the world copper production comes from the ore of chalcopyrite (CuFeS 2{}_22​). The extraction of copper from chalcopynite involves partial roasting, removal of iron and self-reduction.Iron is removed from chalcopyrite as
  1. A
    FeO
  2. B
    FeS
  3. C
    Fe 2{}_22​ O 3{}_33​
  4. D
    FeSiO 3{}_33​
View written solutionFree

Correct answer: D

  1. Identify the process used in copper extraction from chalcopyrite

    Chalcopyrite is CuFeS2\mathrm{CuFeS_2}CuFeS2​. During extraction, the ore is first partially roasted in air.

  2. What happens to iron during roasting?

    On roasting, iron sulphide present in the ore gets oxidized to iron oxide: 2FeS+3O2→2FeO+2SO2\mathrm{2FeS + 3O_2 \rightarrow 2FeO + 2SO_2}2FeS+3O2​→2FeO+2SO2​ So iron is converted into FeO\mathrm{FeO}FeO.

  3. How is iron removed?

    In the smelting step, silica (SiO2)\mathrm{(SiO_2)}(SiO2​) is added as flux. The iron oxide reacts with silica to form iron silicate slag: FeO+SiO2→FeSiO3\mathrm{FeO + SiO_2 \rightarrow FeSiO_3}FeO+SiO2​→FeSiO3​

    This slag is removed.

  4. Conclusion

    Therefore, iron is removed from chalcopyrite as ferrous silicate, FeSiO3\mathrm{FeSiO_3}FeSiO3​.

  5. Check options

    • A: FeO\mathrm{FeO}FeO — intermediate formed, not the final removed form.
    • B: FeS\mathrm{FeS}FeS — not removed as sulphide.
    • C: Fe2O3\mathrm{Fe_2O_3}Fe2​O3​ — not the slag form here.
    • D: FeSiO3\mathrm{FeSiO_3}FeSiO3​ — correct.

Hence, the correct option is D.

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